Last updated 2026-07-09
TL;DR
Functional Communication Training (FCT) teaches a child to communicate instead of using problem behavior to get what they need, using prompting and reinforcement. It's been studied since 1985 and is recommended by ASHA and the AAP. The best autism center programs pair a credentialed BCBA with a speech-language pathologist, tailor the replacement behavior to the individual child, and involve parents in daily carry-over. No single center is universally best; quality comes down to specific practices you can check before enrolling.
Functional Communication Training, almost always shortened to FCT, was developed by Edward Carr and Mark Durand in 1985 [1]. The idea behind it is straightforward: if a child hits, screams, or melts down to get something, whether that's attention, a break, a preferred item, or sensory relief, you teach them a communicative behavior that gets them the same thing more efficiently. Once the problem behavior stops working, it tends to fade.
The replacement behavior can be whatever the child can actually do: a spoken word, a sign, a picture card, a button press on a speech-generating device, a full AAC device system. That flexibility matters more than most people realize. FCT isn't tied to one communication method. A child who is entirely nonverbal can do FCT with a switch that says "break please," and a verbal child can do it with a spoken phrase. The method bends to fit the learner.
The process has three parts. First, a functional behavior assessment (FBA) figures out why the behavior is happening, since you can't choose a good replacement message without knowing its function. Second, a specific communicative response is selected and systematically prompted. Third, that response gets reinforced consistently while the problem behavior is put on extinction, meaning it stops producing the outcome it used to. Carr and Durand's original study reported that FCT reduced problem behavior by 80 to 90 percent in some participants [1].
FCT sits within Applied Behavior Analysis, but plenty of speech-language pathologists use it too, often working alongside behavior analysts. ASHA lists it as an evidence-based practice for individuals with autism [2].
How solid is the research behind it?
Quite solid, actually, unusually so for a behavioral intervention. A 2008 review by Tiger, Hanley, and Bruzek looked at 89 FCT studies and concluded that FCT "has been shown to be a durable and generalizable treatment" across ages, settings, and communication modalities [3]. That review spanned preschoolers to adults and classrooms to clinics, and found consistent drops in problem behavior alongside gains in communication.
The National Autism Center's National Standards Project classified FCT as an "established" treatment, its highest evidence rating [4]. The AAP's 2020 clinical report on autism interventions lists behavioral interventions with naturalistic developmental components, FCT among them, as having the strongest evidence for communication outcomes [5].
Nobody has perfect numbers on how FCT's effect size in real center-based programs compares to controlled research conditions. Controlled studies show very large effects; real-world programs tend to show meaningful but more modest reductions, closer to 40 to 60 percent, depending on how well the intervention is actually implemented. That gap is normal in behavioral research, and it mostly comes down to treatment fidelity and how consistently parents and staff carry the intervention across settings.
What separates a strong FCT program from a weak one
Any center can put "FCT" on a brochure. Here's what actually distinguishes the programs that work.
It starts with a real functional behavior assessment. FCT without an FBA is guesswork. A genuine FBA involves direct observation, interviews with parents and teachers, and often structured experimental conditions called a functional analysis. Ask how the center conducts its FBAs and how long the process takes. A 15-minute checklist doesn't count.
The replacement communication form also needs to match where the child actually is. If a child has no reliable spoken language, the center shouldn't be holding out for speech as the goal. This is the biggest failure I see in practice. A picture exchange, a sign, or an AAC device should be on the table from day one.
A speech-language pathologist should be involved, not just a BCBA. BCBAs are trained in behavior analysis and can run FCT well, but an SLP brings specific expertise in communication form, motor planning, language development, and augmentative and alternative communication that shapes how the replacement behavior gets chosen and taught. The strongest programs have both.
Parents need to be trained to run the protocol at home, too. Generalization is the hardest part of any behavioral intervention: if FCT only happens in the therapy room, that's the only place the child learns to use it. Centers that coach parents to run the same protocol at home, with feedback along the way, get much better outcomes. Wacker et al. (2013) found FCT delivered primarily by parents via telehealth produced outcomes comparable to clinic-based delivery [6].
Data should be collected and shared, too. Frequency of the problem behavior and frequency of the replacement communication ought to be tracked every session. If a center can't show you a graph of these over time, they're not doing FCT with real rigor.
And the replacement behavior should be reviewed regularly, since kids grow. A picture card might be the right starting point, and a speech-generating device might be the right endpoint years later. Good programs build in a process for expanding the child's communication system as they progress; for a broader view of how FCT fits into the bigger picture, see speech therapy and autism.
Comparing centers on program structure
There's no universal accreditation that flags a great FCT program specifically, but there are structural markers you can check before you ever set foot in a center.
| Feature | Strong FCT program | Weak FCT program |
|---|---|---|
| FBA process | Multi-method, 2+ weeks of data | Brief checklist or skipped |
| Staff credentials | BCBA + SLP collaboration | One discipline only |
| Communication modality | Chosen based on child's current profile | Speech-only or device-only |
| Parent training | Structured, with competency check | Verbal advice in hallway |
| Data system | Session-by-session graphs | Monthly summary at best |
| Generalization plan | Written, across settings and partners | Not addressed |
| Review cycle | Every 4 to 6 weeks | When parents ask |
Centers affiliated with university programs often have stronger research alignment: they tend to publish their outcomes and stay involved in ongoing research, which keeps their protocols current. Community ABA centers vary enormously. Some are excellent. Others run outdated protocols because staff turnover is high and training investment is low.
The Behavior Analyst Certification Board maintains a public registry where you can verify BCBA credentials [7], and ASHA has a similar ProFind tool for SLPs [2]. Check both before you enroll.
What to ask before you enroll
Bring this list to any intake meeting; the answers will tell you almost everything you need to know. Ask what their functional behavior assessment process looks like and who conducts it, how they decide on the replacement communication form, and whether a speech-language pathologist is on staff and involved in FCT planning. Ask what happens if your child is nonverbal or has limited motor speech, and whether AAC is used as a replacement behavior. Ask how they train parents to run the protocol at home, whether you can see a sample data graph from a past case (de-identified), and how often the plan is formally reviewed. Ask what they do when the replacement behavior isn't reducing the problem behavior, what staff-to-child ratio they use during sessions, and how they handle extinction bursts, the temporary increase in problem behavior that often happens when FCT starts. That last question is one most parents don't think to ask, and it reveals a lot. Extinction bursts are predictable and can be intense. A center with a clear, calm protocol for handling them is a center that's actually doing FCT correctly.
How much does FCT through an autism center cost? Honestly, it depends, and the range is wide enough that I want to walk through the pieces rather than give you a single number. ABA therapy, the most common delivery vehicle for FCT, runs roughly $120 to $200 per hour for direct therapy in the United States, with big regional swings [8]. Center-based ABA programs typically run 10 to 40 hours a week depending on the child's age and needs, so the math adds up fast. There's some relief built into the system, though. As of 2024, all 50 states have insurance mandates requiring coverage of ABA therapy for autism, though what's covered and for how many hours still varies by state and insurer. Medicaid covers ABA in most states for eligible children. Getting insurance to pre-authorize enough hours for a real FCT program sometimes takes a letter of medical necessity from the treating team, and occasionally a formal appeal. University-based clinics often use sliding-scale fees and sometimes offer FCT through research studies at reduced or no cost, so it's worth checking if you live near a university with an autism research program. Speech therapy sessions, which may include FCT work from the SLP side, average $100 to $250 per session out of pocket, but most health plans cover some SLP services. And for children under three, early intervention services are federally mandated to be free to families under Part C of IDEA [9]. **How FCT relates to PECS, AAC, and other approaches** Parents often hear these terms tossed around interchangeably and wonder what they're actually being offered. The short version: FCT is the framework, and PECS, AAC, signs, and speech are the tools that fill it in. FCT itself is a behavioral intervention framework, it explains why and how you teach communication (to replace problem behavior, using reinforcement and prompting), but it doesn't specify which communication system to use. PECS (Picture Exchange Communication System) is a specific AAC approach with its own structured teaching protocol, and it can serve as the replacement behavior inside an FCT plan. They're not competing systems; they're often combined. AAC devices, whether speech-generating devices, apps, or dedicated communication systems, are tools too. A good FCT program for a nonverbal child will almost certainly lean on some form of AAC as the replacement response, since pointing to a picture or pressing a button is often easier to learn than speech when speech isn't yet reliable. Verbally-based approaches like PROMPT (Prompts for Restructuring Oral Muscular Phonetic Targets) target motor speech production and matter for kids with apraxia of speech. That's not FCT, but the two might run side by side if a child's problem behavior is partly rooted in frustration over communication breakdowns. Think of it this way: FCT answers the why and how, while PECS, AAC, signs, and speech answer the what. A good center will spell this out clearly in the child's plan. **What age FCT works for, including nonverbal children** FCT has been studied and used with children as young as 18 months in early intervention settings, all the way through adulthood [3]. There's no upper age limit: the intervention works for a 3-year-old with limited communication just as it does for a 25-year-old with an intellectual disability and problem behavior. For nonverbal children, FCT is particularly well-supported, and the research doesn't require spoken language as the outcome. A child who learns to hand over a picture card or press a button to request a break has learned functional communication, and that's the goal. Some children who start FCT with nonverbal replacement responses go on to develop speech as their confidence and opportunities grow, but that's not guaranteed and shouldn't become quiet pressure on a nonverbal child. If your child's speech therapy team has flagged echolalia, it's worth knowing that some forms of echolalia can actually be a starting point for functional communication, since the child is already attempting to communicate. An SLP familiar with FCT can help map those echolalic patterns onto more conventional replacement behaviors. Early intervention before age 3 tends to produce the largest effects, which lines up with what we know about brain plasticity generally, but the literature documents meaningful gains from FCT at every age. **Finding a reputable program** Start with credentials rather than marketing. ASHA's ProFind tool (asha.org) lets you search for SLPs by specialty, including autism, and you can filter by state to find practitioners who list ASD and AAC as areas of focus [2]. The BACB's certificant registry lets you verify that a BCBA is in good standing by searching name or location at bacb.com [7]. Your state's autism insurance mandate may also include a list of in-network providers, and calling your insurance company to ask specifically for BCBAs who provide ABA with a communication focus is a reasonable place to start. University-based autism clinics are often the strongest option for families who can reach one; the Association of University Centers on Disabilities (AUCD) keeps a network map of member centers, many of which see the public [10]. Regional autism centers funded through HRSA's Autism CARES Act programs exist in many states too, often providing direct services or referral networks, and the HRSA website keeps a current list [11]. Once you've found a potential center, ask current families for references, and ask specifically whether the program adjusted the communication modality to fit their child. A parent describing how the team switched from PECS to a speech-generating device when their child needed it tells you far more than a stack of generic positive reviews. **How long it takes to see results** In controlled research settings, FCT often produces measurable reductions in target behavior within 2 to 8 weeks of consistent implementation [3]. Real-world timelines are messier and harder to predict. Consistency matters most: if FCT runs in the clinic but not at home or school, generalization drags out. The severity and history of the behavior matter too, since a behavior reinforced for years has more momentum than one that just emerged, and it takes longer to teach the brain a new path. Extinction bursts, the temporary spike in problem behavior when the old behavior stops working, typically peak in the first week or two and then fade. If a center promises there won't be any increase in behavior during FCT, walk away. That's not how extinction works, and a center that won't warn you about it is either uninformed or avoiding an uncomfortable conversation. A realistic marker to look for: data showing the target behavior trending down and the replacement communication trending up within 4 to 8 weeks. If you're not seeing both trends by 10 to 12 weeks, the FBA probably missed the function, and the plan needs revising rather than more patience. **Home and telehealth delivery** Yes, FCT can be done at home or online, and the evidence for it holds up well. The Wacker et al. (2013) study mentioned earlier found that FCT delivered via telehealth with parent implementation produced outcomes comparable to clinic-based delivery [6], using video coaching where the therapist watched sessions remotely and fed parents real-time guidance through an earpiece. For families who can't reach a strong center-based program because of geography, long wait lists (common at nearly every autism center in the country), or cost, parent-implemented FCT with remote coaching is a legitimate path. It takes a motivated parent and a skilled remote clinician, but it's not a shortcut the way skipping the FBA would be. Online speech therapy platforms increasingly build parent coaching into their model, which fits naturally with FCT principles, especially for young children where parent-mediated intervention already has strong evidence behind it. Between formal sessions, tools that support daily practice can help. Little Words (littlewords.ai/start) is an AI speech companion built for neurodivergent kids, and some families use it to keep communication opportunities frequent and low-pressure between FCT sessions. One honest caution about doing this entirely on your own: without an FBA, you're guessing at the function of the behavior, and a parent who assumes a behavior is attention-seeking when it's actually escape-motivated will end up reinforcing the very thing they're trying to fix. Remote supervision from a BCBA or SLP, even just monthly, is worth the cost.Most FCT programs go wrong in a handful of predictable ways. Skipping or shortcutting the functional behavior assessment (FBA) is the biggest one: if you get the function wrong, the replacement message is wrong too, and the whole intervention ends up solving a problem that isn't actually there. A related mistake is treating speech as the only acceptable replacement behavior. Some centers lean so hard toward spoken language as the end goal that they won't introduce AAC even when a child has no reliable speech yet. That's not just a preference issue, it's clinically wrong, and it can delay a child's progress by months or years. Training matters just as much as the plan itself. A replacement behavior that only works with one therapist in one room isn't a functional skill, it's a party trick. Every adult in the child's life, parents and teachers included, needs to respond the same way for the new behavior to generalize. This connects directly to a third failure point: inconsistent extinction. If the old problem behavior still works even occasionally, say a teacher gives in during one meltdown, that's enough to keep the behavior alive indefinitely. Centers that don't actively train and monitor everyone involved are setting this failure up without meaning to. Finally, plans go stale. An FCT plan that hasn't been touched in six months is probably out of date, because kids change. A replacement behavior that made sense at age 4 may not cover what a child needs to communicate at age 6. If you spot any of these patterns at your child's program, bring it up directly with the supervisor. Sometimes a frank conversation fixes it. Other times it's a sign of a deeper quality problem, and that might mean it's time to look elsewhere.Common questions about FCT
What exactly is functional communication training?
FCT teaches a child to use a specific communicative behavior, a word, sign, picture, or device output, in place of a problem behavior that serves the same purpose (hitting to get a break, screaming for attention, and so on). Carr and Durand developed it in 1985, and the National Autism Center classifies it as an established treatment.
Will insurance pay for it?
Usually. Every state now mandates insurance coverage for ABA therapy, and FCT is typically delivered as part of an ABA program, though coverage details vary by state and insurer. Medicaid covers ABA for eligible children in most states, and a letter of medical necessity from the treating team often smooths authorization. For kids under three, early intervention services under IDEA Part C come at no cost to families.
How does FCT relate to ABA overall?
ABA is the umbrella: discrete trial training, naturalistic teaching, behavior support plans, and more all live under it. FCT is one specific procedure within that framework, using tools like reinforcement, extinction, and prompting to build communication as a replacement for problem behavior. A center can run ABA without ever doing FCT, but real FCT always starts with a functional behavior assessment.
Does it work for kids who don't talk?
Yes. Nothing in the FCT research requires spoken words. A nonverbal child can use picture cards, signs, or a speech-generating device as the replacement behavior. Some children go on to develop speech as their communication opportunities expand, but that's a bonus, not a requirement. The actual goal is a reliable way to get needs across, in whatever form works.
Who should be running this?
You want a Board Certified Behavior Analyst (BCBA) handling the functional behavior assessment and the behavior support plan, and a licensed Speech-Language Pathologist (SLP) involved in choosing and shaping the replacement communication. You can check a BCBA's status through the BACB certificant registry at bacb.com, and verify an SLP through ASHA's ProFind tool at asha.org. Make sure both credentials are current.
How fast should things improve?
In controlled studies, measurable drops in problem behavior often show up within 2 to 8 weeks of consistent implementation, though real-world timing depends heavily on how consistently the plan is followed across home, school, and therapy. Expect a temporary uptick in the behavior during the first week or two (more on that below). If there's no clear downward trend by 10 to 12 weeks, the FBA probably missed the actual function, and the plan needs a second look.
What's an extinction burst?
It's the predictable, temporary spike in problem behavior that shows up right when FCT starts and the old behavior stops getting the old payoff. It usually peaks in the first week or two, then fades as the child figures out the new way works better. If a center warns you this is coming and has a plan for handling it, that's a good sign. If they tell you behavior will improve right away, be skeptical.
Why does the FBA matter so much?
The FBA identifies why the problem behavior is happening, whether that's escaping a demand, getting attention, accessing something the child wants, or seeking sensory input. Without that answer, you can't pick the right replacement. A real FBA involves direct observation, interviews with parents and teachers, and sometimes structured test conditions, not a 15-minute checklist. Weak FBAs are the number one reason FCT programs don't work.
Can this be done at home instead of at a center?
Yes, with the right remote support. Research by Wacker and colleagues found that FCT delivered by parents via telehealth produced results comparable to clinic-based programs. What matters is that a BCBA conducts or supervises the FBA, parents get structured training, and coaching continues with real feedback. Trying to do FCT entirely on your own, without professional guidance, risks targeting the wrong function and accidentally reinforcing the very behavior you're trying to reduce.
Where do I even start looking?
ASHA's ProFind tool (asha.org) can point you to SLPs who specialize in autism and AAC, and the BACB registry (bacb.com) lets you verify BCBAs. It's worth checking whether your state has an HRSA-funded autism center with a referral network, and university-based autism clinics (searchable through the AUCD network at aucd.org) often provide direct services using current protocols. Whoever you're considering, ask them directly how they conduct their functional behavior assessments before signing on.
Is this only for young children?
No, FCT works across the lifespan, with research covering everyone from toddlers in early intervention to adults with intellectual disability and autism. Older individuals may have more entrenched problem behaviors from years of reinforcement, which can slow things down, but the approach still works. The replacement communication just gets matched to whatever the person's current abilities and needs are.
Which AAC option is best?
Whichever one the child can actually produce reliably in the moment. Picture exchange (PECS) suits kids with strong visual skills and some intentional reach. Speech-generating devices work for kids who can select targets on a screen or switch. Manual signs fit kids with good motor imitation. An SLP should assess motor planning, vision, and imitation skills to help make this call, and it's worth revisiting as the child grows.
Sources
- Carr & Durand (1985), Journal of Applied Behavior Analysis: 'Reducing behavior problems through functional communication training': FCT was developed in 1985 by Carr and Durand; original study reported 80-90% reductions in problem behavior in some participants
- American Speech-Language-Hearing Association (ASHA): Autism Spectrum Disorder evidence maps and ProFind tool: ASHA lists FCT as an evidence-based practice for autism and provides a professional finder tool for SLPs
- Tiger, Hanley & Bruzek (2008), Behavior Analysis in Practice: 'Functional communication training: A review and practical guide': Review of 89 FCT studies concluded FCT has been shown to be a durable and generalizable treatment across ages and settings
- National Autism Center: National Standards Project, Phase 2: The National Autism Center classified FCT as an 'established' treatment meeting the highest evidence bar
- American Academy of Pediatrics (AAP): 2020 clinical report on autism spectrum disorder interventions: AAP 2020 clinical report lists behavioral interventions including FCT among those with the strongest evidence for communication outcomes in autism
- Wacker et al. (2013), Journal of Applied Behavior Analysis: 'Conducting functional analyses of problem behavior via telehealth': FCT implemented primarily by parents via telehealth produced outcomes comparable to clinic-based delivery
- Behavior Analyst Certification Board (BACB): Certificant registry: BACB maintains a public registry where BCBA credentials and standing can be verified
- Autism Speaks: ABA therapy cost and insurance coverage overview: ABA therapy costs approximately $120 to $200 per hour for direct therapy in the United States
- U.S. Department of Education: IDEA Part C early intervention program overview: Under IDEA Part C, early intervention services for children under three are federally mandated at no cost to eligible families
- Association of University Centers on Disabilities (AUCD): Network member directory: AUCD maintains a network of university-based disability centers, many of which offer direct clinical services to the public
- Health Resources and Services Administration (HRSA): Autism CARES Act funded programs: HRSA funds regional autism centers through the Autism CARES Act that provide direct services and referral networks in many states